<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{path:'/home'}">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <tree-table class="treeTable" :data="cateList" :columns="columns"
      :selection-type="false" :expand-type="false"
      show-index border :show-row-hover="false">
      <template slot="isok" slot-scope="scope">
        <i class="el-icon-success" v-if="scope.row.cat_deleted===false"
        style="color: lightgreen;"></i>
        <i class="el-icon-error" v-else
        style="color: red;"></i>
      </template>
      <template slot="order" slot-scope="scope">
        <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
        <el-tag size="mini" type="success"
        v-if="scope.row.cat_level===1">二级</el-tag>
        <el-tag size="mini" type="warning"
        v-if="scope.row.cat_level===2">三级</el-tag>
      </template>
      <template slot="opt" slot-scope="scope">
        <el-button type="primary" icon="el-icon-edit" size="mini"
        @click="showEditDialog(scope.row.cat_id)">编辑</el-button>
        <el-button type="danger" icon="el-icon-delete" size="mini"
        @click="removeCateById(scope.row.cat_id)">删除</el-button>
      </template>
      </tree-table>

      <el-pagination
            @size-change="handleSizeChange"
            @current-change="handleCurrentChange"
            :current-page="queryInfo.pagenum"
            :page-sizes="[3,5,10,15]"
            :page-size="queryInfo.pagesize"
            layout="total, sizes, prev, pager, next, jumper"
            :total="total">
          </el-pagination>
    </el-card>

    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="30%"
      @close="addCateDialogClosed">
      <el-form ref="addCateFormRef" :model="addCateForm"
      :rules="addCateFormRules" label-width="100px">
        <el-form-item label="分类名称:" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类:">
          <el-cascader  :options="parentCateList"
          v-model="selectedKeys" :props="cascaderProps"
          @change="parentCateChanged" clearable
          >
          </el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible=false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>

    <el-dialog
      title="修改商品"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed">
      <el-form ref="editFormRef" :model="editForm"
      :rules="editFormRules" label-width="70px">
        <el-form-item label="商品名:" prop="cat_name">
          <el-input v-model="editForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible=false">取 消</el-button>
        <el-button type="primary" @click="editCateInfo">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      cateList: [],
      total: 0,
      columns: [{
        label: '分类名称',
        prop: 'cat_name'
      },
      {
        label: '是否有效',
        type: 'template',
        template: 'isok'
      },
      {
        label: '排序',
        type: 'template',
        template: 'order'
      },
      {
        label: '操作',
        type: 'template',
        template: 'opt'
      }
      ],
      addCateDialogVisible: false,
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        cat_level: 0
      },
      addCateFormRules: {
        cat_name: [{
          required: true, message: '请输入分类名称', trigger: 'blur'
        }]
      },
      parentCateList: [],
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover',
        checkStrictly: 'true'
      },
      selectedKeys: [],
      editDialogVisible: false,
      editForm: {},
      editFormRules: {
        cat_name: [{
          required: true, message: '请输入商品名', trigger: 'blur'
        },
        {
          min: 2, max: 10, message: '商品名的长度在2~10个字符之间', trigger: 'blur'
        }]
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    async getCateList () {
      const { data: res } =
      await this.$http.get('categories',
        { params: this.queryInfo })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.cateList = res.data.result
      this.total = res.data.total
    },
    handleSizeChange (newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    handleCurrentChange (newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    showAddCateDialog () {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    async getParentCateList () {
      const { data: res } =
      await this.$http.get('categories',
        { params: { type: 2 } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类数据失败！')
      }
      this.parentCateList = res.data
    },
    parentCateChanged () {
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid =
        this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cat_level = this.selectedKeys.length
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    addCate () {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } =
        await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类失败！')
        }
        this.$message.success('添加分类成功！')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    },
    addCateDialogClosed () {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    },
    async showEditDialog (id) {
      const { data: res } = await this.$http.get('categories/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('查询商品信息失败！')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    editCateInfo () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put('categories/' + this.editForm.cat_id,
          { cat_name: this.editForm.cat_name })
        if (res.meta.status !== 200) {
          return this.$message.error('更新商品信息失败！')
        }
        this.editDialogVisible = false
        this.getCateList()
        this.$message.success('更新商品信息成功！')
      })
    },
    async removeCateById (id) {
      const confirmResult = await this.$confirm('此操作将永久删除该商品, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message({
          type: 'info', message: '已取消删除'
        })
      }
      const { data: res } = await this.$http.delete('categories/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('删除商品失败！')
      }
      this.$message.success('删除商品成功！')
      this.getCateList()
    }
  }
}
</script>

<style lang="less" scoped>
  .treeTable{
    margin-top: 15px;
  }
  .el-cascader{
    width: 100%;
  }
</style>
